I like a lot of them. Sometimes they are generic or they are a bit off on being a response to some quest-giver's lines but most are perfect.

Besides, no one can get tired of this Sith Inquisitor line:

"Yawn..."

No, most are not perfect, clicking a funny answer and getting "i do not fear you" sucks so bad, it makes you just skip the rest of the conversation every time.
Inquisitor and Agent are ok, and smuggler is nice too, but still, it gets boring after so many times, and there is nothing GOOD about it, its just less annoying with those classes.